Radio Caroline began test broadcasts during the evening of 27 March 1964, and commenced regular programming at noon the following day, on 28 March. It broadcast from a former Danish ferry, the Fredericia renamed MV Caroline and anchored three miles off the coast of Felixstowe, just outside British territorial waters. In April 1964, Radio Atlanta began broadcasting from the MV Mi Amigo, a former coaster anchored off Harwich. Both stations operated independently for several months but the companies' sales operations were later merged. The Caroline moved to an anchorage off Ramsey, Isle of Man and broadcast as Radio Caroline North while the MV Mi Amigo remained off Essex broadcasting as Radio Caroline South.